One of our best surprise boxes, the Inventor’s Surprise Box, measures 5" x 5" x 3" and is chock-full of various items such as semiconductors, LEDs, resistors, capacitors, inductors, switches, wires, hardware, lamps, and displays. While you may not find every type of item listed, you’ll also discover sophisticated components not mentioned above! Each box is different. Start inventing as soon as your surprise box arrives!